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科学家发明世界最轻材料

所属:生活杂谈 来源:dailymail 阅读:2982 次 评论:1 条 [我要评论]  [+我要收藏]

小编摘要:这种世界上最轻的固体材料比头发还要细一千倍,把它放在蒲公英上都不会对蒲公英的种子有丝毫损坏,是不是很惊人啊!这种材料未来将有广泛的用途。

导读:科学家们发明了世界上最轻的材料,这种物质有极小的空心金属管组成,它99.99%的成分都是空气,厚度比人头发还要细上一千倍,重量比泡沫聚苯乙烯要轻上百倍,具有超强的吸收能量的能力。未来可在绝热、电极、消音、减震等方面发挥巨大作用。

Scientists claim to have created the world’s lightest solid material, a metal which can sit atop a dandelion without even crushing its seeds.

The substance is made of tiny hollow metallic tubes – the walls of which are 1,000 times thinner than those of a human hair – arranged into a criss-crossing diagonal pattern with small open spaces between them.

The researchers say the material, which consists of 99.99 percent air, is 100 times lighter than Styrofoam and has ‘extraordinarily high energy absorption’ properties.

Its potential future uses include thermal insulation, battery electrodes, and products to dampen sounds or vibration, or absorb shock.

The research, published in the latest edition of the journal Science, was carried out at the University of California, and the Irvine and HRL laboratories.

The engineers say the material’s strength derives from the ordered nature of its lattice design.

William Carter, of HRL, said: ‘Modern buildings, exemplified by the Eiffel Tower or the Golden Gate Bridge, are incredibly light and weight-efficient by virtue of their architecture.

'We are revolutionising lightweight materials by bringing this concept to the nano and micro scales.’

Lead author Dr Tobias Schaedler, said: 'The trick is to fabricate a lattice of interconnected hollow tubes with a wall thickness 1,000 times thinner than a human hair.

'The resulting material has a density of 0.9 milligrams per cubic centimetre'.

By comparison the density of silica aerogels - the world's lightest solid materials - is only as low as 1.0mg per cubic cm.

The engineers say the material's strength derives from the ordered nature of its lattice design.

Other ultralight substances, including aerogels and metallic foams, have random cellular structures meaning they are less stiff, strong, energy absorptive or conductive than the bulk of the raw materials that they are made out of.

To study the strength of the metallic micro-lattices the team compressed them until they were half as thick.

After removing the load the substance recovered 98 per cent of its original height and resumed its original shape.

The first time the stress test was carried out and repeated the material became less stiff and strong, but the team says that further compressions made very little difference.

'Materials actually get stronger as the dimensions are reduced to the nanoscale,' said team member Lorenzo Valdevit.

'Combine this with the possibility of tailoring the architecture of the micro-lattice and you have a unique cellular material.'

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2011-11-22 14:43 编辑:lilylikelily
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